x.iter().zip(range(0,x.len()))

[pythonesque]

I have seen this a couple of times, don't know how easy it is to detect (given the variations) but the person wants is x.iter().enumerate().

[pythonesque]

Worth noting, if x is ever called with a &mut method after len() is called this might not be redundant.

[Manishearth]

assigned to @nweston

[bluss]

not redundant if you zip with a non-usize range.